Lack of service and communication

I bought an Apple product some years ago and financing is done through Standard Bank credit service. For years I was diligently paying my monthly installment, up until recently when I stopped receiving statements.

I keep receiving emails, calls and sms's from Standard bank that my account is in arrears. I've been paying this account since 2019 or 2018, can't be sure. The last statement I received was in May 2020 and there wasn't a large amount outstanding. I've been paying the usual installment on a monthly basis. I have not paid since February 2021 because I haven't been receiving statements for some time and I'm pretty sure there is no more outstanding amount. Be it as it may, every time I receive an email/call/sms stating that my account is in arrears, I ask that they please send me a detailed statement with the full amount outstanding so that I can settle it. Standard Bank then either does not reply or reply saying I need to send them my ID number, full names, address etc - which I am unwilling to do due to so much ***** going around. Also, the whole structure of their automated email signatures looks very ***** and suspect. I am not convinced that it is Standard Bank replying. Surely if I've been a 'client' since early 2018/2019, they should have my details - and if they had sent me statements in the past, why not now? I refuse to make any further payments until I've seen a statement and I refuse to give my personal details over email. Can someone at Standard Bank please send me a statement so I can close the account and then I never in my entire life want to ever have anything to do with Standard Bank.